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Add test to ensure optimized-out struct members don't cause problems.
As seen in http://code.google.com/p/chromium/issues/detail?id=155258 ANGLE had a bug where setting the values for uniforms at the end of a struct that were optimized out could cause other uniforms to be modified.
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sdk/tests/conformance/uniforms/gl-uniform-struct-unused.html
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| <!-- | ||
| /* | ||
| ** Copyright (c) 2012 The Khronos Group Inc. | ||
| ** | ||
| ** Permission is hereby granted, free of charge, to any person obtaining a | ||
| ** copy of this software and/or associated documentation files (the | ||
| ** "Materials"), to deal in the Materials without restriction, including | ||
| ** without limitation the rights to use, copy, modify, merge, publish, | ||
| ** distribute, sublicense, and/or sell copies of the Materials, and to | ||
| ** permit persons to whom the Materials are furnished to do so, subject to | ||
| ** the following conditions: | ||
| ** | ||
| ** The above copyright notice and this permission notice shall be included | ||
| ** in all copies or substantial portions of the Materials. | ||
| ** | ||
| ** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
| ** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
| ** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | ||
| ** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY | ||
| ** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, | ||
| ** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | ||
| ** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS. | ||
| */ | ||
| --> | ||
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| <!DOCTYPE html> | ||
| <html> | ||
| <head> | ||
| <meta charset="utf-8"> | ||
| <title>WebGL uniform struct Conformance Test</title> | ||
| <link rel="stylesheet" href="../../resources/js-test-style.css"/> | ||
| <script src="../../resources/js-test-pre.js"></script> | ||
| <script src="../resources/webgl-test.js"></script> | ||
| <script src="../resources/webgl-test-utils.js"></script> | ||
| </head> | ||
| <body> | ||
| <div id="description"></div> | ||
| <div id="console"></div> | ||
| <canvas id="example" width="2" height="2"> </canvas> | ||
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| <script id="vshader" type="x-shader/x-vertex"> | ||
| attribute vec4 vPosition; | ||
| uniform vec4 u0; | ||
| struct MyStruct { | ||
| vec4 var1; | ||
| vec4 var2; | ||
| vec4 var3; | ||
| vec4 var4; | ||
| }; | ||
| uniform MyStruct u1; | ||
| uniform vec4 u2; | ||
| varying vec4 v_color; | ||
| void main() | ||
| { | ||
| gl_Position = vPosition; | ||
| v_color = (u0 + u2 + u1.var1) - vec4(2.0); | ||
| } | ||
| </script> | ||
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| <script id="fshader" type="x-shader/x-fragment"> | ||
| precision mediump float; | ||
| varying vec4 v_color; | ||
| void main() | ||
| { | ||
| gl_FragColor = v_color; | ||
| } | ||
| </script> | ||
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| <script> | ||
| description("This test ensures WebGL implementations handle unused members at the end of structs correctly."); | ||
|
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| var wtu = WebGLTestUtils; | ||
| var gl = wtu.create3DContext(); | ||
| var c = document.getElementById("console"); | ||
| program = setupProgram(gl, "vshader", "fshader", [ "vPosition"]); | ||
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| wtu.setupUnitQuad(gl, [0, 1]); | ||
| var white = [1.0, 1.0, 1.0, 1.0]; | ||
| var black = [0.0, 0.0, 0.0, 0.0]; | ||
| gl.uniform4fv(gl.getUniformLocation(program, "u0"), white); | ||
| gl.uniform4fv(gl.getUniformLocation(program, "u1.var1"), white); | ||
| gl.uniform4fv(gl.getUniformLocation(program, "u1.var2"), black); | ||
| gl.uniform4fv(gl.getUniformLocation(program, "u1.var3"), black); | ||
| gl.uniform4fv(gl.getUniformLocation(program, "u1.var4"), black); | ||
| gl.uniform4fv(gl.getUniformLocation(program, "u2"), white); | ||
| wtu.drawQuad(gl); | ||
| wtu.checkCanvas(gl, [255, 255, 255, 255], "should be white", 0); | ||
| gl.uniform4fv(gl.getUniformLocation(program, "u1.var2"), black); | ||
| gl.uniform4fv(gl.getUniformLocation(program, "u1.var3"), black); | ||
| gl.uniform4fv(gl.getUniformLocation(program, "u1.var4"), black); | ||
| wtu.drawQuad(gl, [0, 0, 0, 0]); | ||
| wtu.checkCanvas(gl, [255, 255, 255, 255], "should still be white", 0); | ||
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| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no GL errors"); | ||
| debug(""); | ||
| successfullyParsed = true; | ||
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| </script> | ||
| <script src="../../resources/js-test-post.js"></script> | ||
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| </body> | ||
| </html> |